Method for preparing fuel cell membrane electrode with sealing frame

Abstract

The invention discloses a method for preparing a fuel cell membrane electrode with a sealing frame. The process is simple and easy to realize. The method comprises the following steps: feeding a polymer electrolyte membrane and a sealing frame material with a layer of hot melt adhesive into a rolling device of a hot pressing platform, jointing the sealing frame material to edges of two sides of the polymer electrolyte membrane through heating rolling, and laminating a gas diffusion layer coated with a catalytic layer on two sides of the polymer electrolyte membrane so as to form a membrane electrode component. In the preparation process, a catalyst liquid is directly coated on the gas diffusion layer instead of the polymer electrolyte membrane, so that damage to a catalytic layer is reduced, the situation that later process is affected by swelling deformation of the membrane in the spraying process is avoided, the formation procedure can be simplified, continuous large-scale production of GDE and MEA can be conveniently achieved, and the production efficiency is greatly improved.

Description

technical field [0001] The invention relates to a preparation method of a fuel cell membrane electrode, in particular to a preparation method of a fuel cell membrane electrode with a sealed frame that reduces damage to a catalytic layer and can be produced continuously; it belongs to the technical field of fuel cell preparation. Background technique [0002] A fuel cell is a device that can convert hydrogen fuel and oxidant into electrical energy and reaction products. The internal core component of the device is a membrane electrode (Membrane Electrode Assembly, referred to as MEA). The membrane electrode (MEA) is mainly composed of two very conductive A good porous gas diffusion layer is composed of a layer of polymer electrolyte membrane sandwiched in the middle, and a large number of finely dispersed catalyst layers that can initiate electrochemical reactions are evenly distributed on the interface between the polymer electrolyte membrane and the gas diffusion layer. [...

AI Technical Summary

Problems solved by technology

This technology has high sealing reliability, good manufacturability, and saves membrane materials, but the hot pressing time is long and the production efficiency is low

[0008] Chinese patent CN200480030791.7 introduces a core component and membrane electrode with a sealing material. Thermoplastic polymers, elastic sealing bodies and thermosetting polymers are used as sealing materials. The edges of the polymer electrolyte membrane are protected by sealing materials, and the gas diffusion layer is uniform. Using sealing materials to isolate the cathode and anode reactants, this method can obtain better sealing performance, but there are many processes, which increases the difficulty of preparation

This method can achieve better sealing, but the polymer electrolyte membrane is easy to swell and deform during the spraying process, and the spraying method is easy to spray the slurry on the sealing gasket, which is not conducive to the positioning of the active area and causes waste of catalyst slurry

[0012] It can be seen from the above that there are various methods for preparing membrane electrodes in the prior art. From the perspective of commercialization, it is important to be able to achieve good sealing performance, but it is also important to be able to mass-produce. The above methods are in view of one or another problem Unable to be applied in industrialized production and needs improvement urgently

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